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b) tan a = 3/4
Tinggal mencari sisi depan = √5²-(-4)² = √9 = 3 cm
a) Sin A = depan / miring (y/r) = -3/5 ( Sin-nya minus karna di kuadran 3)
b) Tan A = depan / samping (y/x) = 3/4 (tan positif karna di kw. III)
Semoga membantu :))